SHAPE MEMORY ALLOY DRIVER

摘要

A shape memory alloy driver comprises displacement detecting means, drive control means, and compensation calculating means. The displacement detecting means detects the displacement of a shape memory alloy from the resistance value and so forth detected from the shape memory alloy. The drive control means applies voltage or current to the shape memory alloy by servo control and thereby displaces the shape memory alloy to a target displacement value given by a microcomputer or the like. The compensation calculating means calculates a compensation displacement value from the detected displacement value and a variation due to the environment temperature of the drive control value which the drive control means uses for controlling the voltage or current. On being given the compensation displacement value, the drive control means varies the drive control value so that the compensation displacement value agrees with the target displacement value.